feat: add isEnterpriseInstall to Context

[rockingskier]

Summary

#1510 - Add isEnterpriseInstall to aid in processing events.

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[rockingskier]

I've just seen that events have access to body.authorizations[0].is_enterprise_install and actions have access to body.is_enterprise_install. However, given that Bolt has already parsed this information I think it'd be nice to have it available on context :)

[filmaj]

Looks good to me! Wow I had no idea of how complex the installation scenarios could be (i.e. individual workspace installs that exist inside an enterprise org). Thank you for this change 🙇

[filmaj]

@rockingskier looks like some of the tests are failing, I believe because some unrelated tests are using empty mock objects for the context property, but due to this PR, context now requires the isEnterpriseInstall property in it. Do you think you can update these so that the tests pass?

[rockingskier]

Thanks, @filmaj. That was embarrassingly obvious :D
All fixed up and working locally now.

[codecov]

Codecov Report

Merging #1511 (f2bd0d0) into main (7eec438) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #1511   +/-   ##
=======================================
  Coverage   82.00%   82.00%           
=======================================
  Files          18       18           
  Lines        1495     1495           
  Branches      435      435           
=======================================
  Hits         1226     1226           
  Misses        172      172           
  Partials       97       97           

Impacted Files	Coverage Δ
src/App.ts	83.87% <ø> (ø)
src/types/middleware.ts	100.00% <ø> (ø)

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[filmaj]

Thank you very much @rockingskier ! Much appreciated 🙇